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Originally Posted by tech12
Except for the fact that SF and SJ are already part of the same CSA, share public transit (including BART, soon), share radio/tv stations, share sports teams, share government stuff (the Metropolitan Transportation Commission covers both MSAs, for example), and identify as being within the same region. None of that is true for NYC and philly.
The truth is that the US census methodology for determining MSAs (and urban areas) works well with a more typical development layout of a central city with suburbs radiating outwards, but it's reliance on commuter interchange and contigous development of a certain density/width, doesn't play nice with multi-nodal metro areas with development patterns that are constrained by geography, and in the case of the Bay Area, breaks it down too much. That doesnt mean that multi-nodal metros aren't metros though.
Go ask someone living in vallejo if their city is a suburb of SF/Oakland. They'll say yes....yet the census considers vallejo to be the principal city of a separate metro area. Sometimes the ideas that work on paper just don't reflect reality.
Of course the CSA definition isnt perfect either. Most people don't consider Santa Cruz and Stockton to be part of the Bay Area, for example. But it is more accurate for this region than the MSA measurement is, when trying to figure out the extent of the SF/Oakland/SJ metro area.
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First off, transit is shared in NYC and Philly... maybe by different names and governed by different authorities, but it's still basically one (albeit very major) connected rail system. It's just a much different situation in the Bay Area in terms of the age, size, influence, individual economic power, etc. of the cities. I get it... San Jose would likely not have a transit system at all and probably would be a pretty awful place if San Francisco didn't exist... so I definitely get the tight connection.
Second, I totally agree with what you're saying and the whole MSA or CSA designation more often than not does not represent reality. So really, the fact that SF and SJ are part of the same CSA and NYC and Philly are not really doesn't matter (particularly in the context of economic connections/wealth). Though I definitely agree that SF/SJ metro areas are one.
I'm just saying that if we want to start grouping highly-connected and merged, yet arbitrarily distinct cities/metros together, then it has to apply across the board, if we are to make truly meaningful comparison.
If one were to take the what... 50-60? mile radius/footprint of the combined SF/SJ metro areas and say they are one, well then you gotta do the same with the east coast , if we're to have a truly valid comparison. We can't pick and choose and say NYC metro is it's own distinct non-connected place and it ends precisely at Trenton, NJ (for example) only because it happens to be on the New Jersey side of the river... when it can be very easily argued that Trenton is more a suburb of Philadelphia than it is New York.